So tired of my baby not sleeping

My daughter is a year old now and has always been an awful sleeper. For the past 4-5 weeks now it has gotten so much worse! Waking up multiple times a night like she’s a newborn again. She has slept through the night in the past but she’s never been consistent with it. Sometimes it was a night here or there, sometimes it was a few nights in a row and we thought we were getting somewhere and then it would stop. She has also not napped well, but around Christmas time she suddenly started napping great, taking 1-2 hour naps at a time instead of her usual 30 minute naps. She has now gone back to the 30 minute naps and still not sleeping well at night. We have tried everything, letting her cry doesn’t work either, bc she gets herself so worked up to the point of hyperventilating or throwing up within 5 minutes! I think she may be getting a cold which I know would not be helping right now, but it wouldn’t explain why she’s been doing worse for the past month or so. I know she’s in a leap right now and that’s also probably not helping, but she clearly has some sleep issues since it’s been a year of this. We are exhausted and very tired of this! We shouldn’t be struggling still a year into this. I have barely been able to take care of myself this past year and feel like I shouldn’t be struggling like I have a newborn at this age. I see all these other moms who have there shit together and I’m over here not even able to take care of myself still. We need help and have no family around to help us out. We’ve been doing this all on our own, with an occasional visit from family, but even when they are here, they don’t help us out at night with her. If anyone has any advice on what we can do with her, it would be greatly appreciated. Maybe there’s something out there I haven’t tried that might work! TIA!